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TABLE 3 HISTORICAL ANALYTICAL RESULTS OF GROUND WATER SAMPLES 1 EPA METHODS 8015M, 8020 Former Chase Chevrolet (Van Buren) Facility 424 North Van Buren Street, Stockton, California ' (µg/1) ' Sample Sample Depth to TPH as Ethyl- Location Date Water �asolme MTBE Benzene Toluene benzene Xylene (Screen} ' MW-6 01-10-91 2652 2,900 NA 210 130 56 360 (209-45) 02-27-92 2773 12,000 NA 730 450 360 880 ' 05-28-92 2751 11,000 NA 320 140 120 510 09-16-92 2796 4,500 NA 210 100 87 450 11-05-92 2824 5,300 NA 240 250 97 560 02-11-93 2792 6,500 NA 260 56 59 290 ' 02-08-94 2716 2,800 NA 180 110 130 480 05-04-94 2714 3,600 NA 210 210 150 670 08-05-94 2680 1,600 NA 88 76 91 350 12-20-94 2738 5,000 NA 200 160 200 1,100 ' 05-11-95 2412 3,100 NA 130 100 150 370 10-05-95 2303 2,400 NA 140 63 180 280 02-09-96 2269 1,500 NA 65 50 92 220 05-08-96 2079 6,500 <7 270 270 380 1,400 08-08-96 2059 6,100 <50 330 160 360 900 11-06-96 2108 5,100 <95 290 110 380 860 02-05-97 1603 830 <5 0 56 I7 17 190 05-07-97 1818 1,200 <5 0 88 1 2 Ito 130 I 08-06-97 1838 950 <5 0 80 31 69 140 11-05-97 19 12 2,600 <8 220 2 4 220 340 02-05-98 1608 470 <5 0 32 <05 42 38 05-08-98 1386 2,600 <5 0 150 11 250 290 08-13-98 1447 2,100 <10 130 27 220 260 11-04-98 1626 1,600 <50 88 062 160 170 02-04-99 1560 1,200 <5 0 66 063 130 130 05-05-99 1476 2,100 <5 0 76 37 170 160 08-10-99 1530 <50 <5 0 <05 <05 <0 5 <05 11-10-99 1651 1,400 <50 66 31 64 61 02-09-00 15 87 710 <50 17 084 81 21 05-11-00 1460 1,200 <10 24 <05 320 67 08-22-00 1504 150 <50 30 <05 14 30 11-28-00 16 16 1,400 <50 21 16 79 86 02-28-01 1571 100 <50 19 <0 5 12 070 05-21-01 15 68 390 <50 45 <05 29 23 08-16-01 1611 330 <10 S 8 <05 36 12 11-14-01 1733 620 <5 0 238 13 65 31 02-13-01 1626 340 <50 61 1 1 71 15 I I